I recently replaced an upper radiator hose in my SDL because it sprung a major leak. I've topped off the coolant to the V-mark on the overflow reservoir. Even with the full level the coolant indicator comes on while driving. Another thing: when the engine is running (hot) the overflow tank seems about 3-4 inches lower than when the engine is off - is that normal?! Just don't understand why that indicator is coming on when the fluid level is at max. I should also mention that I've never had that indicator come on until the leak started it all... the indicator helped me find that there is a leak.

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1987 Mercedes 300SDL; SOLD
1985 Mercedes 300D; SOLD
2006 Honda Pilot - wife's ride; 122K;
1995 Toyota Land Cruiser - 3X locked; 182K